What is the author's style in Omen by Edward Hirsch?

One of the important stylistic devices in Hirsch's poem is his use of flashback to the speaker's childhood. The transitions to and from the three stanzas that flashback to the speaker's summer and autumn childhood nights are carefully and artfully placed so that they echo the words and ideas of the present setting. For example, stanza 5 uses the word "boy" to connect seamlessly to the word "boyish" in stanza 4. Also, Hirsch ties the emotions of the speaker's childhood to the friend's experience in the hospital; the airlessness of the hospital connects to the speaker being unable to breathe in his sleep, and the friend's repetitive pain and fear connects to the speaker's emotions during the autumn nights of his childhood. In the concluding stanzas of the poem, Hirsch integrates flashbacks completely within the present narrative by placing the speaker in the same situation as that of his childhood autumn nights. At both points in his life, the speaker sits indoors, sorrowful and enclosed, and waits for the rain to fall on him.